[MLton-user] power of 2 optimisation

[Franck Arnaud]

Hello,

Does mlton optimise for div/mod by constant powers of 2?
that is:

 val const = 16
 fun div16 x = x div const

would compile to a bit shift by 4 bits rather than a division.
(mlton's excellent profiler tells me I'm spending 1/4 of my 
time in div and mod, despite my having selected powers of 2s)

If it does not, maybe an interesting question is whether it 
should or is it better that the programmer uses shifts 
explicitely?

--
franck@nenie.org


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